package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

/**
 * 自定义切面、实现公共字段自动填充处理逻辑
 */

@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    /**
     * 指定切入点
     */
    @Pointcut("execution(* com.sky.mapper.*.*(..)) " +
            "&& @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut(){
    }

    /**
     * 前置通知
     */
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint){

        log.info("使用AOP开始进行公共字段填充-------");
        //获取到当前被拦裁的方法上的数据库操作类型
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);
        OperationType type = autoFill.value();
        //获取到当前被拦被的方法的参数--实体对象
        Object[] args = joinPoint.getArgs();
        Object arg = args[0];
        //准备赋值的数据
        LocalDateTime time = LocalDateTime.now();
        Long id = BaseContext.getCurrentId();
        //根据当前不同的操作类型。为对应的属性通过反射来赋值
        if(type == OperationType.INSERT){
            //为四个公共字段赋值
            try {
                Method setcreatetime = arg.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method stcreateuser = arg.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setupdatetime = arg.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setupdateuser = arg.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                //通过反射为属性赋值
                setcreatetime.invoke(arg,time);
                stcreateuser.invoke(arg,id);
                setupdatetime.invoke(arg,time);
                setupdateuser.invoke(arg,id);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }else if(type == OperationType.UPDATE){
            //为两个公共字段复制
            try {
                Method setupdatetime = arg.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setupdateuser = arg.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                //通过反射为属性赋值
                setupdatetime.invoke(arg,time);
                setupdateuser.invoke(arg,id);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}
